Roller



(No Model) 3 Sheets- Sheet 1.

O. T. HANNA.

ROLLER GRINDING MILL. 110.308.25 1; Patented Nov. 18. 1884.

1 'ATTORNIQ N4 PEIERS. Phoh ulhogrnphun Wuhinglon. 11c.

(No Model.) I 3 Sheets-Sheet 2.

O. T. HANNA.

ROLLER GRINDING MILL. No. 308,254. Patented Nov. 18, 1884;

WITNESSES: I INVENTOR,

ATTORN EY.

N. PETERS. Phum-Lxlhugnphcr. Washinghm. D.C.

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(No Model.)

N 0.. T. HANNA.

ROLLER GRINDING MILL.

- Patented Nov. 18, 1884.

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WITN ESSE'S:

CYRUS T. HANNA, OF ALLEGHENY, PENNSYLVANIA.

ROLLER GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 308,254, dated November18, 1884.

Application filed May 13, 1884. (No model.)

To all whom it may concern:

Be it known that I, GYRUs T. HANNA, a citizen of the United States,residing at Allegheny, in the county of Allegheny and State ofPennsylvania, have invented or discovered certain new'and usefulImprovements in Roller Grinding-Mills, of which improvements thefollowing is a specification.

In the accompanying drawings, which make part of this specification,Figure 1, Sheet 1, is an end view, partly in section, of a when grindingmill embodying my invention; Fig. 2, Sheet 2, a side View in elevationof the same; Fig. 3, a vertical section, on an enlarged scale, throughone of the bearings of the feedroll driving-shaft; Fig. 4, Sheet 1, atransverse section through one of the bed-plates of the frame, with aroll-bearing in elevation; Fig. 5, Sheet 3, a side view in elevation ofone of the housings of the roll-adjusting mechanism; Fig. 6, an end viewin elevation of the same, as seen from the left; ,Fig. 7, a verticallongitudinal central section through the same; Fig. 8, a transversesection through the same at the-line ax of Fig. 7; and Fig. 9 a view,

partly in elevation and parlyin section, of the adjacent or abuttingportions of the wormshafts and hand-wheels of one of the adjustingmechanisms.

My present invention, which relates to roller grinding-mills of theclass exemplified in Letters Patent of the United States Nos. 253,698and 272,043, granted and issued to me under dates of February 14, 1882,and February 13, 1883, respectively, is designed to provide foreifecting a closer and more accurate adjustment of the rolls toward andfrom one another than has heretofore been practicable; to enable suchadjustment to be effected upon one end of the roll independently of theother or coincidently upon both ends, as desired; to provide improvedmeans for the vertical adjustment of the roll-bearings, and to enablethe tightening-pulley to be accurately adjusted in proper positionforcarrying the drivingbelt. To these ends my improvements consists incertain novel devices and combinations, hereinafter fully set forth andclaimed.

In the practice of my invention the operative mechanism is mounted upona frame, 1, having horizontal bed-plates 2 on the top of each of itsvertical side members, upon which are supported the bearings orpillow-blocks 3 of two or more pairs or sets of crushing and grindingrolls, which are cast together with or fixed upon shafts at 5 6 7.

In my Letters Patent Nos. 253,698 and 27 2,043 aforesaid the verticaladjustment of the rolls was effected through sliding wedgeplates,whichsupported the roll-bearings, said wedge-plates being inclined on theirlower faces, resting on corresponding inclines on the bed-plates of theframe, and I have herein illustrated such"constructionas applied to thebearings of the roll-shafts 4 and 5.

Under my present invention, which, in this particular, is shown hereinas applied to the bearings of the roll-shafts 6 and 7, the wedgeplatesand their accessories are dispensed with, and a curved or segmentalrecess, 8, is formed transversely in the bottom of each of the bearings3, which are supported at or near each end of their bases by adjListing-bolts 9, engaging female threads in the bed-plate 2. The bolts 9are turned off spherically at their ends to a radius equal to orslightly less than that of the segmental recesses 8 of the bearings, andit will thus be seen that the latter are free to rock or vibrate uponthe bolts as pivots in any vertical adjustment in which they may beplaced by the raising or lowering of the bolts, and can adapt themselveswith corresponding nicety to the alignment of the journals which theysupport. A bolt, 10, secured to each bearing, projects downwardlytherefrom through the bed-platein line with the center of the rollshaft, and is provided with a main and alock 'nut below the bed-plate,by which the bearing may be secured in any adjusted position.

The horizontal adjustment of the roll-shaft is, as in my prior patentsabove referred to, effected through threaded stems connected to theshaftbearings and movable in opposite di rections by nuts. In lieu,however, of rotat ing the nuts of said stems directly by a wrench orhandle, as in my prior eonstructions,whieh operation failed to affordthe exactness of adj ustment which is desirable, aswellas necessitatedthe separate manipulation of each end of the shaft, I provide under mypresent invention means whereby any desired degree of variation, howeverslight, of the distance be tween the axes of the rollshaft may bereadily and accurately attained, and also enable IOO the adjustment ofthe opposite ends of the shafts to be either independently orcoincidently effected, as now to be described.

Inasmuch as one roll only of each pair need be movable in making thehorizontal adj ustment, and as the outer rolls are most convenientlyaccessible for the purpose, the adjusting mechanism is applied only tothe bearings of the outer rollshafts 4 and 7. Ahorizontal stem, 11,which is provided wit-h an external thread at and adjacent to its outerend, is connected to each of the hearings or pillow-blocks 3 of theroll-shafts 4 and 7, the connection being by preference made in themanner shown in Fig. 1-that is to say, by the engagement of a head orprojection, 12, on the inner end of the stem 11 with a recess, socket,or projection on the bearing 3. The stems 11 pass freely throughexternallythreaded sleeves 13, which are fixed in vertical standards orhousings 14 on the outer ends of the bed-plates 2, and also pass freelythrough casings 15, secured to said housings.

A disk, 16, having a circular series of alternate projections, 17, anddepressions, acting as cams on its inner face, is mounted freely on eachof the stems 11, exterior to a housing, 14, its cam-face entering arecess in the housing and engaging a cam-face of corresponding form onthe outer end of the sleeve 13, which is fixed therein. The function ofthe disk 16 will be presently explained. Along nut, 18, en gages thethreads of each stem 11, exterior to the disk 16, and a worm-wheel, 19,is fitted upon a key or feather, 20, on the nut18, which is thus free tomove longitudinally within the worm-wheel 19 while engaged with saidwheel, so as to rotate therewith in either directionin which it may beturned. A worm-shaft, 21, on which is formed a worm, 22, engaging theworm-wheel 19, is mounted in bearings 23, secured to the casing of eachworm-wheel; and the two worm -shafts, which thus actuate the worms ateach end of the outer rollshafts, 4 and 7, are arranged in line axially,and are adapted to be turned by the operator either coincidently orindependently, as desired. To this end a hand-wheel, 24, is secured uponeach worm-shaft adjacent to thecasing within which its worm rotates, andhand-wheels are fixed upon the meeting ends of the two worm-shafts ofeach rollshaft. Said worm-shafts are maintained accurately in line by acentral cylindrical projection, which is formed upon the end of oneshaft and enters a corresponding recess in the other, and the adjacentfaces of the handwheels 25, which are plane and perpendicular to theaxial line of the shafts, are located as closely as practicable togetherwithout being in contact. It will therefore be seen that the operatorcan, by applying his hand to the two adjoining hand-wheels 25,simultaneously rotate bot-h the worm-shafts of each roll-shaft in eitherdirection, and thus effect the simultaneous adjustment through theinduced longitudinal movement of the stems 11 of both bearings of theroll-shaft, or, by the separate manipulation of the hand-wheels 24, hecan adjust either bearing of the shaft, as may be desired. It will befurther obvious that by the actuation of the nuts 18 through the wormsand worm-wheels an accuracy of adjustment will be obtained which ismaterially greater than that effected by the direct action of a wrenchor handle, as heretofore practiced.

The duty of the cam-faced disks 16 is, as in my patents before referredto, to enable one of the rolls of each pair to he moved entirely clearof the other from time to time, when material is not passing through therolls, and thereafter to be returned to operative position, whenrequired, without varying the adjustment. To this end an arm, 26, isfixed to each of the disks 16, andthe arms 26 of the disks of each ofthe outer roll-shafts are coupled by a link, 27, so as to be movablecoincidently by the operator. In the partial rotation of the disks 16their cam projections 17, moving upwardly upon the correspondinginclines of the sleeves 13, force the disks outwardly, the latterbearing against and carrying with them in their outward movement thenuts 18, stems 11, and the connected bearings 3 of the outerroll-shafts. The latter are returned to operative position upon therelease of the stems 11, in the movement of the disks 16 in reversedirection, by helical springs 28, surrounding the stems 13, and bearingat one end against the outer bearings, 3, and at the other end againstshouldered sockets 29, fitting freely on the sleeves 13. The sockets 29abut against tightening-nuts 30, engaging the threads of the sleeves 13,and fixed in position by jam-nuts 31.

The rolls of each pair are, as is usual in roller-mills of the characterto which my im- I provements relate, driven at different velocities,respectively. The arrangement of belts and pulleys for driving the rollsneed not be herein at length illustrated and set forth, as the same doesn.ot,pcr se, constitute part of my present invention, and is, moreover,fully described in my Letters Patent No. 253, 698, aforesaid. Thedriving-belt passes from the main or counter shaft of the prime moveraround a pulley, 32, on the shaft of one of the faster moving rolls,thence around a pulley, 33, on a shaft, 34, which may be termed thedriving shaft of the slower-moving rolls, and thence around a pulley,32, on the shaft of the other faster-moving roll of the other pair. Theslower-moving rolls are driven by a belt passing around a pulley, 35, onthe shaft 34, thence around a tightening-pulley, 36, and thence aroundpulleys 37 on the shafts of the slowermoving rolls. The feed-rolls arerotated from a feed-roll-driving shaft, 38, mounted in bearings 39 onthe casing of the mill, and carrying a pulley, 40, around which passes abelt from a pulley, 41, on the shaft of one of the slower-moving rolls.

IIO

To enable the tightening-pulley 36 to be adthe driving-belt of theslower-moving rolls. it is mounted freely upon a shaft, 42, which isfixed in an arm, 43, projecting from a sleeve or socket, 44, which fitson a horizontal supporting and adj usting, bar, 45, which is movableendwise in bearings in the frame 1 of the mill. The socket 44 may beadjusted both longitudinally and axially on the bar 45, and secured inadjusted position by clamping-screws 46, engaging threads in the socketand bearing on the shaft, and the position of the tight ening-pulleymaythus be accurately regulated in conformity with the proper angle of thedrivingbelt. The feed-roll shafts 47 48 are driven bya pinion, 49, onthe shaft 38, said pinion engaging a gear, 50, on the feedroll shaft 47,which gear in turn engages a gear, 51, on the feed-roll shaft 48.

To enable the rotation of the feed-roll shafts to be readily stopped andresumed from time to time, as required in the operation of the machine,the pinion 49 is mounted freely upon the feed-roll-driving shaft 38, andis made fast or loose thereon, according as the feed-rolls are desiredto be driven or to remain stationary, by a clutch, 52, sliding on a keyor feather, 53, on the shaft, and adapted to engage corresponding clutchprojections, '54, on the adjacentside of the pinion 49. The clutch ismoved toward and from the pinion by a shipping-lever, 55, pivoted to thebearing-frame of the shaft 38, and having a forked arm engaging a grooveon the clutch, said lever carrying upon its outer end a counter-balance,56, by the gravity of which the clutch is maintained in positionlongitudinally upon the shaft when either engaged wit-h or disengagedfrom the pinion.

I claim herein as my invention- 4 1. Inarollergrinding-mill, thecombination of a bed-plate, a pair of adjusting-bolts engaging internalthreads therein and having rounded ends, a roll-bearing supportedadjacent to each of its sides upon said adj ustingbolts, and having atransverse segmental groove to receive the rounded ends thereof, alocking-bolt fixed to the bearing between the adjustingbolts and passingfreely through the frame, and a nut engaging a thread on saidlocking-bolt, substantially as set forth.

2. In a roller grinding-mill, the'combination of a pair ofroll-bearings, a bed-plate provided with standards, threaded stemsconnected to said bearings and carrying nuts which transfer appliedpressure to said standards upon the bed-plate, two worm-wheels, eachadapted to rotate one of said nuts, and two worm-shafts mounted in lineaxially, each of said shafts carrying a worm engaging one of saidwormwheels, and a pair of hand-wheels, one of the hand-wheels of eachworm-shaft being fixed thereon adjacent to the adjoining worm-shaft, andthe other handwheel at a point nearer to its worm-wheel, these membersbeing combined for joint operation to effect either. the separate or theconjoined rotation of the wormwheels and nuts, substantially as setforth.

3. In a roller grinding-mill, the combination of a pair of worm-shaftsmounted in line axial- 1y, one of said shafts having-a cylindricalprojection concentric with its body, which enters a corresponding recessin the adjacent end of the other shaft, a pair of operating hand wheels,each secured upon one of said shafts, said wheels being in suchproximity as to be adapted to simultaneous rotation by an operator, apair of hand-wheels, each fixed upon one of said shafts at a pointcloser to the worm thereof than the hand-wheel first-specified, a pairof roll-bearings, and mechanism, as ,described, for adjusting saidbearings by the rotation of the worm-shafts, substantially as set forth.

4. The combination of a threaded adj ustingstem, a nut thereon, aworm-wheel fitted by a key or feather on said nut, a cam-faced diskfitting around said stem and bearing at one side against the nut and atthe other against a corresponding face in a standard or housing, acasing inclosing said worm-wheel and disk, and secured to the housing,and a worm engaging said wornrwheel and supported by a bearing-castingsecured to said casing, substantially as set forth.

In a roller grindingmill, the combination of an adjusting and supportingbar, mounted with the capacity of longitudinal movement in bearings inthe frame, a sleeve or socket fitting freely on said bar, so as to beadjustable axially thereon, clamping-screws engaging threads in thesocket and bearing on the bar, and a tightening-pulley mounted on ashaft fixed in SllCl socket, substantially as set forth.

In testimony whereofl have hereunto set my hand.

CYRUS T. HANNA;

\Vitnesses:

J SNowDEN BELL, S. HARVEY THOMPSON.

IOC

